摘要
目前,对预应力碳纤维布加固梁的疲劳性能研究甚少。通过对7根预应力碳纤维布加固混凝土T形梁弯曲疲劳性能的试验研究,考察了预应力碳纤维布加固量、钢筋配筋率、等幅变幅疲劳以及加固前疲劳损伤对加固梁疲劳性能的影响。试验结果表明,与非预应力碳纤维布加固梁相比,预应力碳纤维布加固后混凝土梁中受拉钢筋应力幅显著降低,混凝土梁疲劳寿命明显延长。
Externally bonded prestressed carbon fiber reinforced polymer（CFRP）sheets for reinforced concrete（RC） beams strengthening is becoming an effectiveness strengthening method recently, especially to increase the service life under fatigue loading. Though there are some researches on the behavior of RC beams strengthened with prestressed CFRP sheets under static loading, however, researches on the improvement of fatigue performance are very limited. In this paper, the flexural fatigue behavior of RC beams strengthened with prestressed CFRP sheets is investigated with 7 specimens, in which the influences of strengthening amount of prestressed CFRP sheets, ratio of reinforcement,variable-amplitude fatigue loading and damage before strengthening are taken into consideration. Experimental results show that the stress amplitude of the tensioned bar is decreased remarkably and the fatigue life is then obviously increased as compared to normal strengthening method.
出处
《工业建筑》
CSCD
北大核心
2005年第8期13-19,共7页
Industrial Construction
基金
国家自然科学重点基金(编号:50238030)
国家"863"研究计划(编号:2001AA336010)资助项目。
